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| Nordblom, Thomas L.; Reeson, Andrew; Whitten, Stuart M.; Finlayson, John D.; Kelly, Jason A.; Hume, Iain H.. |
| Shortfalls in water supplies are perhaps the greatest practical NRM policy concern in Australia today, looming larger in many minds than the great international debates on greenhouse gasses, climate change and biodiversity. Because forest land cover uses more water than any other, wide expansion of upstream tree plantations can significantly reduce water yields upon which downstream urban, agricultural and wetlands depend. We consider the economic efficiency and equity (profitability and distributional) consequences of upstream land use change. The ‘environmental services’ of concern in our study are the mean annual quantities and qualities (volumes and salt concentrations) of water flowing from upper parts of a catchment to the downstream interests... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Experimental economics; Land use; Rival water uses; MBI; Environmental Economics and Policy; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/6249 |
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| Nordblom, Thomas L.; Hume, Iain H.; Finlayson, John D.; Kelly, Jason A.; Welsh, Rob; Hean, Robyn L.. |
| The net present value (NPV) of downstream economic benefits of changes in water-yield (W) and salt-load (S) of mean annual river flow received by a lower catchment from an upper catchment are described as a 3-dimensional (NPV,W, S) surface, where dNPV/dW > 0 and dNPV/d(S/W) < 0. Upstream changes in land use (i.e. forest clearing or forest establishment, which result in higher or lower water-yields, respectively) are driven by economic consequences for land owners. This paper defines conditions under which costs of strategic upstream land use changes could be exceeded by compensations afforded by downstream benefits from altered water-yields and/or lower salt loads. The paper presents methods, and preliminary calculations for an example river,... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Policy markets upstream downstream water; Salinity Land Economics/Use. |
| Ano: 2007 |
URL: http://purl.umn.edu/10355 |
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| Nordblom, Thomas L.; Hume, Iain H.; Bathgate, Andrew D.; Reynolds, Michael. |
| Land managers in upper catchments are being asked to make expensive changes in land use, such as by planting trees, to attain environmental service targets, including reduced salt loads in rivers, to meet needs of downstream towns, farms and natural habitats. End-of-valley targets for salt loads have sometimes been set without a quantitative model of cause and effect regarding impacts on water yields, economic efficiency or distribution of costs and benefits among stakeholders. This paper presents a method for calculating a ‘menu’ of technically feasible options for changes from current to future mean water yields and salt loads from upstream catchments having local groundwater flow systems, and the land-use changes to attain each of these options at... |
| Tipo: Journal Article |
Palavras-chave: Discounting; Landuse; NPV; Opportunity-cost; Salinity; Resource /Energy Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/116973 |
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| Nordblom, Thomas L.; Hume, Iain H.; Cresswell, Hamish; Glover, Mark; Hean, Robyn L.; Finlayson, John D.; Wang, Enli. |
| Although dryland farming and grazing have been practiced for over 130 years in the 17,000 ha Simmons Creek catchment without surface salinity problems, the area has been identified as a significant source of salt seepage to Billabong Creek in the NSW Murray catchment. Groundwater movement and salinity levels are spatially heterogenous at Simmons Creek. Groundwater of the upper catchment is relatively fresh and seemingly unconnected with the highly saline groundwater of the lower catchment. However, fresh surface water does flow from the upper to the lower catchment. This spatial diversity provokes the question of where high-water-use forest habitats might be placed to achieve different combinations of environmental services (greater water yield, lower... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Optimisation; Opportunity costs; Forest-habitat; Environmental services; Environmental Economics and Policy. |
| Ano: 2007 |
URL: http://purl.umn.edu/10357 |
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